/*
 * Created on May 18, 2005
 */
package org.flexdock.perspective;

import java.awt.Component;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Vector;

import org.flexdock.docking.Dockable;
import org.flexdock.docking.DockingManager;
import org.flexdock.docking.state.DockingState;
import org.flexdock.event.EventManager;
import org.flexdock.perspective.event.RegistrationEvent;
import org.flexdock.perspective.restore.handlers.AlreadyRestoredHandler;
import org.flexdock.perspective.restore.handlers.DockPathHandler;
import org.flexdock.perspective.restore.handlers.FloatingHandler;
import org.flexdock.perspective.restore.handlers.MinimizedHandler;
import org.flexdock.perspective.restore.handlers.PointHandler;
import org.flexdock.perspective.restore.handlers.RelativeHandler;
import org.flexdock.perspective.restore.handlers.RestorationHandler;
import org.flexdock.perspective.restore.handlers.UnknownStateHandler;
import org.flexdock.util.RootWindow;

/**
 * @author Christopher Butler
 */
public class RestorationManager {

    private static final RestorationManager SINGLETON = new RestorationManager();

    private Vector restorationHandlers = new Vector();
	
	static {
		getInstance().addHandler(new AlreadyRestoredHandler());
		getInstance().addHandler(new FloatingHandler());
		getInstance().addHandler(new MinimizedHandler());
		getInstance().addHandler(new RelativeHandler());
		getInstance().addHandler(new DockPathHandler());
		getInstance().addHandler(new PointHandler());
		getInstance().addHandler(new UnknownStateHandler());
	}

    private RestorationManager() {
        //prevent instant..
    }

	public static RestorationManager getInstance() {
		return SINGLETON;
	}
	
	public void addHandler(RestorationHandler handler) {
		if(handler!=null) {
			restorationHandlers.add(handler);
			EventManager.dispatch(new RegistrationEvent(handler, this, true));
		}
	}
	
	public boolean removeHandler(RestorationHandler handler) {
		boolean ret = false;
		if(handler!=null) {
			ret = restorationHandlers.remove(handler);
			if(ret)
				EventManager.dispatch(new RegistrationEvent(handler, this, false));
		}
		return ret;
	}
	
	
	public boolean restore(Dockable dockable) {
		if(dockable==null)
			return false;

		DockingState info = PerspectiveManager.getInstance().getDockingState(dockable, true);
		HashMap context = new HashMap();
		for(Iterator it=restorationHandlers.iterator(); it.hasNext();) {
			RestorationHandler handler = (RestorationHandler)it.next();
			if(handler.restore(dockable, info, context))
				return true;
		}
		return false;
	}
	
	public static RootWindow getRestoreWindow(Dockable dockable) {
		// TODO: fix this code to keep track of the proper dialog owner
		RootWindow[] windows = DockingManager.getDockingWindows();
		return windows.length==0? null: windows[0];
	}

	public static Component getRestoreContainer(Dockable dockable) {
		RootWindow window = getRestoreWindow(dockable);
		return window==null? null: window.getRootContainer();
	}

}
